Question

Which point is on the graph of y = –2cos x?

A. (2, 0)
B. (0, -2)
C. (2, -2)
D. (0,0)

Answer 1

@whpalmer4 or @jim_thompson5910 can either of you help with this?

Answer 2

check each answer choice

Answer 3

so let's check choice A

Answer 4

y = -2*cos(x)

0 = -2*cos(2) ... plug in x = 2 and y = 0

0 = -2*0.9993908270191

0 = -1.9987816540382

that equation is false, so (2,0) is NOT a point on the graph of y = -2*cos(x)

Answer 5

you do the same for the other choices until you get a true equation

Answer 6

I got B

Answer 7

@jim_thompson5910

Answer 8

B is correct